Stalling after high RPM
 

Just picked up a 1991 200 20VTQ Avant.
Had the speedometer problem, soldered the weak spot, Fixed!
Another problem I am having is that when I go to 4-7 RPMs and push the clutch in, it drops RPMs to around 3-4 hundred and occasionally stalls.
So far it does it in 1st and 2nd gear, haven't have too much trouble at 7000 in 3rd :D

Anyone else have this problem or know how to diagnose?
Thanks.